狭叶酸模 xia ye suan mo

Rumex odontocarpus Sandor ex Borbás; R. stenophyllus var. ussuriensis (Losinskaja) Kitagawa; R. ussuriensis Losinskaja.

Herbs perennial. Roots vertical, large, to 1 cm in diam. Stems erect, 40-80(-120) cm tall, usually branched above, glabrous, grooved. Basal leaves shortly petiolate, lanceolate or narrowly lanceolate, 10-18 × 1.5-4 cm, glabrous or indistinctly papillose along veins below, base cuneate, margin crisped, occasionally nearly flat and entire, apex acute; cauline leaves shortly petiolate or nearly sessile, narrowly lanceolate, small; ocrea fugacious, membranous. Inflorescence paniculate, narrow. Flowers bisexual, dense. Pedicel slender, articulate below middle (in proximal third). Inner tepals enlarged in fruit; valves triangular, 3-4(-5) mm × ca. 3.5 mm, all valves with narrowly ovate tubercles, base truncate to indistinctly cordate, margin denticulate, apex acute; denticles 0.5-1.5 mm, 4-10 at each side. Achenes brown, shiny, ellipsoid, 2.5-3 mm, sharply trigonous, base narrow, apex acute. Fl. May-Jun, fr. Jun-Aug. 2n = 20, 22, 60.

Water sides, field margins, moist valleys; 200-1200 m. Heilongjiang, Jilin, Nei Mongol, Xinjiang [Kazakhstan, Kyrgyzstan, Mongolia, Russia; Europe].